Blue Ash

Fraxinus quadrangulata

Oleaceae · broadleaf deciduous tree · native

Last updated April 25, 2026

Quick Facts

Height

50–70 ft

Spread

50-70 ft

Growth Rate

Medium

Light

Full Sun

Soil

Moist

Water

Moderate

Hardiness

Zone Zones 4a–8b

Bloom Time

April to May

Fall Color

Yellow

Origin

southern Ontario to Michigan to Arkansas and Tennessee

Anthracnose (Shade Trees)High

Primary Spore Release

Nectria CankerHigh

Spore Release (Fall & Spring Rains)

Verticillium WiltHigh

Root Colonization Period

Oystershell scaleHigh

Crawler Emergence

+ 5 more — see full disease and pest lists below

Diseases: Regionally Documented (8)

Neonectria ditissima Nectria Canker Discula destructiva (dogwood), Kabatiella and Discula spp... Anthracnose Coin Canker Symptom category — not a single disease Leaf Spot Mistletoe Phytophthora syringae Phytophthora Canker Verticillium dahliae Verticillium Wilt Sclerotinia spp. White Mottled Rot

Pests: Regionally Documented (8)

Ash borer Aphidoidea Aphid Prionoxystus robiniae Carpenterworm Hyphantria cunea Fall webworm Parthenolecanium spp. Lecanium scale Caloptilia syringella Lilac leafminer Lepidosaphes ulmi Oystershell scale Coccoidea Scale insect

Pests: Other Associations (1)

Agrilus planipennis Emerald ash borer

Data Maturity

Structured Multiple sources. Expert review underway.